mod mark/10
Literally though, I'm not sure. I'd say something like 4 or 5/10 compared to average players these days. I used to be a lot better, though. In 2010 I made it into the final 16 during the World Championships. Not exactly a huge feat, but I thought it was pretty cool.
Also, skill can be examined in several different ways in this game. It's kind of hard to compare multiplayer skill and single player skills because they're totally different things. If I had to rate my single player skill, I'd say it's a lot better than my multiplayer skill, maybe like 6 or 7/10.